[BatFastard]

I haven't coded anything in Unity in a few years, but I did, and others I know well did. They ran into the problem that Unity wants its resources to all be defined at compile time. A metaverse is totally data driven (at least should be), so Unity and a metaverse are not compatible.

[gfxgirl]

VRChat is written in Unity. So is/was Tilt Brush. Even. Virt-a-mate. All loading user generated content just fine.

[fsloth]

This probably would merit context as my employer has implemented several model viewers in Unity which by definition imports resources at runtime.